锐角三角函数是初中“图形与几何”的重点内容之一,也是中考的重要考查内容.本文采撷几例2016年部分省市的中考试题,进行分类评析,供同学们学习时参考.一、考查三角函数的的概念例1(广东)如图1,在RtΔABC中,∠B=30°,∠ACB=90°,CD⊥AB交AB于点D,以CD为较短的直角边向ΔCDB的同侧作RtΔDEC,满足∠E=30°,∠DCE=90°,再用 Sharp-angle trigonometric function is one of the key contents of junior high school “Graphics and Geometry ”, which is also an important examination content of senior high school entrance examination.This paper picks several middle school entrance examination questions in some provinces and cities in 2016, carries on the classification analysis for the students to learn reference. Example 1 (Guangdong) As shown in Fig. 1, in RtΔABC, ∠B = 30 ° and ∠ACB = 90 °, and CD⊥AB intersects AB at point D, with CD being a shorter right-angled side ΔCDB same side for RtΔDEC, ∠E = 30 °, ∠DCE = 90 °, reuse